Circuit/System Verification
WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
- Engine running.
- Verify the E18 Rear Defogger Grid turns ON and OFF when commanding the Rear Defogger On and Off with a scan tool.
- If the E18 Rear Defogger Grid does not turn ON or OFF
Refer to Rear Window Defogger Malfunction .
- Go to next step: If the E18 Rear Defogger Grid turns ON and OFF
- If the E18 Rear Defogger Grid does not turn ON or OFF
- Verify the mirror glass of the A9A Outside Rearview Mirror-Driver and the A9B Outside Rearview Mirror-Passenger become warm when commanding the Rear Defogger On with a scan tool.
- If the mirror glass of the A9A Outside Rearview Mirror-Driver and the A9B Outside Rearview Mirror-Passenger do not become warm
Refer to Circuit/System Testing.
- Go to next step: If the mirror glass of the A9A Outside Rearview Mirror-Driver and the A9B Outside Rearview Mirror-Passenger become warm
- If the mirror glass of the A9A Outside Rearview Mirror-Driver and the A9B Outside Rearview Mirror-Passenger do not become warm
- All OK.